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Not quite - area = pi*r^2, so:

3" pipe = 4,560mm2

2x2.25" = 5,130mm2

2x2.5" = 6,333mm2

5" pipe = 12,667mm2

so as you can see, 2x2.5 is definately not as much area (flow) as a 5" pipe by a long shot

What i was trying to get at is that you'd think that 2x 2.5 inch pipes would flow more then a single 3" pipe!! Probably wrong though for not the first time!

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What i was trying to get at is that you'd think that 2x 2.5 inch pipes would flow more then a single 3" pipe!! Probably wrong though for not the first time!

Well you were on the right track - 2x2.5"s would flow a lot more, but its a lot more surface area than a single 3" and would take more space under the car.

A fairer comparison would be Comparing similar sizes (say 2x2.125" compared to 1x3", both 4560mm2) the flow is almost the same.

Well all i know is this exhaust compared to the trust PE2 this revs up quicker and makes more boost with out changing the settings with the sacrifice of it being almost doubly as loud

but those of you that heard the 4" that i ran for a little bit it isn't quiet as loud as that

instead of having 1 large pipe to get all the flow out of ive gone for a split to keep it high off the ground whilst keeping the flow something a little different too :)

I've got a 3 1/2 inch zorst with a massive center muffler and a hi flow cat and i have no clearance trouble at all, i just took my car to a a good zorst shop and got them to cut it and push the zorst up as hight as they could get it then re-weld it, now i have no problems at all :P

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